# Turning on ln\_cfc11, cfc12 and sf6

**URL:** <https://nemo-ocean.discourse.group/t/turning-on-ln-cfc11-cfc12-and-sf6/1023>\
**Category:** Versions\
**Tags:** TOP\
**Created:** [2 June 2026 13:12 UTC](https://nemo-ocean.discourse.group/t/turning-on-ln-cfc11-cfc12-and-sf6/1023 "2026-06-02T13:12:24Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ErikBuitenhuis](https://avatars.discourse-cdn.com/v4/letter/e/34f0e0/32.png) [@ErikBuitenhuis](https://nemo-ocean.discourse.group/u/ErikBuitenhuis)\
**Post date:** [2 June 2026 13:12 UTC](https://nemo-ocean.discourse.group/t/turning-on-ln-cfc11-cfc12-and-sf6/1023/1 "2026-06-02T13:12:24Z")

</div>

I’m trying to turn on ln\_cfc11, ln\_cfc12 and ln\_sf6 in NEMO\_v5.0. Does anyone have an atmospheric forcing file in the format it expects, and matching namelist\_trc\_ref and/or namelist\_trc\_cfg?

Thanks,

Erik

[e031@uea.ac.uk](mailto:e031@uea.ac.uk)